crypto/tls:gofips140: TestCertCache failures

[gopherbot]

#!watchflakes
default <- pkg == "crypto/tls:gofips140" && test == "TestCertCache"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestCertCache
    cache_test.go:81: timed out waiting for expected ref count
--- FAIL: TestCertCache (4.01s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "crypto/tls:gofips140" && test == "TestCertCache"

2025-05-08 18:21 gotip-linux-amd64-clang15 go@60d3bcde crypto/tls:gofips140.TestCertCache (log)

=== RUN   TestCertCache
    cache_test.go:81: timed out waiting for expected ref count
--- FAIL: TestCertCache (4.01s)

— watchflakes

[gopherbot]

Change https://go.dev/cl/671175 mentions this issue: crypto/tls: use runtime.Gosched instead of time.After in TestCertCache